Apparatus for per



(No Model.)

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APPARATUS PUR PBRSPBGTIVB DRAWING. No. 349,303. Patented Sept. 21, 1886.

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UNITED STATES PATENT OFFICE.

ROBERT hEDMUND GREASEY, OF JERSEY CITY, NEW JERSEY.

APPARATUS FOR PERSPECTIVE DRAWING.

SPECIFICATION forming part of Letters Patent No. 349,303, dated September 21I 1886.

Application tiled J une 12, ISES. Serial No. 204,902. (No model.)

To all whom it may concern:

Be it known that I, ROBERT EDMUND CEEA- sEY, of Jersey City, Hudson county, State of New Jersey, have invented a new and 11n-- proved Apparatus for Perspective Drawing, of which the following specification is a full, clear, and exact description.

This invention relates to an apparatus by means of which different parts of an object to be drawn in perspective may be reduced to the same scale, the apparatus being so constructed that the scale may be readily altered.

The invention consists in the various features of improvement hereinafter more fully pointed out.

ln the accompanying drawings, Figure 1 is a side view of my improved apparatus. Fig.

2 is a vertical central section, partly in side view, of the same with the rod removed. Fig. 3 is a horizont-al section online x ar, Fig. 2, and Fig. lis a diagram showing how the appa- .ratus is used.

The letter n. represents a drum, made of sh eet metal or other material, and preferably open at its lower end while closed at its upper end by a centrally-perforated head, b.

c is a spindle extending centrally through drum a., and passing with one end through head b. Upon the spindle c there is mounted a ratchet-wheel, d, and a hand-Wheel, e, which.

pair of elastic 'concave disks, n n', of which the-disk n is rigidly attached to the spindle while the disk a loosely surrounds it, may be arranged at opposite sides of head b to establish a yielding connection betweenspindle and drum.

To the spindle c there is attached one end of a string, g, that is partially wound around spindle c and passes out of a perforation, 71 of drum a. The outer or free end of string g is provided with a button, z'. The upper end of drum a is covered by a cap, j, having asocket, k, for the reception of one end ot' an upwardlyextending graduated rod, Z. Upon this rod there works a slide, m.

The apparatus is used as follows: The string g is unwound by hand-wheel e until the length of the string unwound is in the same proportion to the distance of the operator from the obj ectA to be sketched as the scale desired is to the height of the object. The pawl f, engaging ratchet-Wheel cl, will prevent further automatic unwinding of the string, so that the same proportion is maintained during the sketching of the same object. The button lis taken into the-mouth and the string is held taut, the apparatus being held somewhat below but in line lbetween the operator and the object A. Next the slide m Ais moved up or down until the upper part ot' the rod l above the slide apparently covers the object. This part of the rod will be the scale desired, and may be laid off upon the paper. Thus one part of the object after the other is taken and is reduced. It' the scale is to be altered, the length of the i'ree portion of the string is inA creased or diminished.

I claim as my inventionl. The combination of drum and spindle c -with the string g, rod Z, and slide m, substantially as specitied.

2. The combination of drum ay with spindle c, ratchet-wheel d, pawl f, hand-wheel e, and string g, and with the rod l and slide m, substantially as specified.

v3. The combination of drum ny with spindle c, ratchet-wheel d, pawl f, hand-wheel e, string g, button fi, cap j, having socket k, and with the rod Z and slide m, substantially as specified.

ROBERT EDMUND OREASEY. Witnesses;

JNO. A. LANDREGAN, H, HARRISON. 

